A high school social studies teacher who was put on leave after comparing President Bush's State of the Union address to speeches made by Adolf Hitler defended his lecture on Tuesday, saying he was trying to encourage students to think. "My job as a teacher is to challenge students to think critically about issues that are affecting our world and our society," Jay Bennish said on NBC's "Today Show." Bennish is on paid leave from Overland High School in suburban Aurora, Colo., while Cherry Creek School District investigates whether his Feb. 1 lecture violated a policy requiring that balancing viewpoints...